udhcpd: allow "domain" to be a list of DNS servers, not just one

2 files changed, 21 insertions, 13 deletions

diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 9ade4ae6d..775f829dd 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -101,19 +101,8 @@ static void attach_option(struct option_set **opt_list,
 {
         struct option_set *existing, *new, **curr;
 
-        /* add it to an existing option */
         existing = find_option(*opt_list, option->code);
-        if (existing) {
-                DEBUG("Attaching option %s to existing member of list", option->name);
-                if (option->flags & OPTION_LIST) {
-                        if (existing->data[OPT_LEN] + length <= 255) {
-                                existing->data = realloc(existing->data,
-                                                existing->data[OPT_LEN] + length + 2);
-                                memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
-                                existing->data[OPT_LEN] += length;
-                        } /* else, ignore the data, we could put this in a second option in the future */
-                } /* else, ignore the new data */
-        } else {
+        if (!existing) {
                 DEBUG("Attaching option %s to list", option->name);
 
                 /* make a new option */
@@ -129,7 +118,26 @@ static void attach_option(struct option_set **opt_list,
 
                 new->next = *curr;
                 *curr = new;
+                return;
         }
+
+        /* add it to an existing option */
+        DEBUG("Attaching option %s to existing member of list", option->name);
+        if (option->flags & OPTION_LIST) {
+                if (existing->data[OPT_LEN] + length <= 255) {
+                        existing->data = xrealloc(existing->data,
+                                        existing->data[OPT_LEN] + length + 3);
+                        if ((option->flags & TYPE_MASK) == OPTION_STRING) {
+                                if (existing->data[OPT_LEN] + length >= 255)
+                                        return;
+                                /* add space separator between STRING options in a list */
+                                existing->data[existing->data[OPT_LEN] + 2] = ' ';
+                                existing->data[OPT_LEN]++;
+                        }
+                        memcpy(existing->data + existing->data[OPT_LEN] + 2, buffer, length);
+                        existing->data[OPT_LEN] += length;
+                } /* else, ignore the data, we could put this in a second option in the future */
+        } /* else, ignore the new data */
 }
 
 
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index 4a46da579..bda6efc7e 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -23,7 +23,7 @@ const struct dhcp_option dhcp_options[] = {
         {"lprsvr",      OPTION_IP | OPTION_LIST,                0x09},
         {"hostname",    OPTION_STRING | OPTION_REQ,             0x0c},
         {"bootsize",    OPTION_U16,                             0x0d},
-        {"domain",      OPTION_STRING | OPTION_REQ,             0x0f},
+        {"domain",      OPTION_STRING | OPTION_LIST | OPTION_REQ, 0x0f},
         {"swapsvr",     OPTION_IP,                              0x10},
         {"rootpath",    OPTION_STRING,                          0x11},
         {"ipttl",       OPTION_U8,                              0x17},